<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{ padding:0; margin:0; list-style:none; border:0;}
.all{
  width:500px;
  height:200px;
  padding:7px;
  border:1px solid #ccc;
  margin:100px auto;
  position:relative;
}
.screen{
	width:500px;
	height:200px;
	 overflow:hidden; 
	position:relative;
}
.screen li{ width:500px; height:200px; overflow:hidden; float:left;}
.screen ul{ position:absolute; left:0; top:0px; width:3000px;}
.all ol{ position:absolute; right:10px; bottom:10px; line-height:20px; text-align:center;}
.all ol li{ float:left; width:20px; height:20px; background:#fff; border:1px solid #ccc; margin-left:10px; cursor:pointer;}
.all ol li.current{ background:yellow;}

#arr {
    display: none;}
#arr span{ width:40px; height:40px; position:absolute; left:5px; top:50%; margin-top:-20px; background:#000; cursor:pointer; line-height:40px; text-align:center; font-weight:bold; font-family:'黑体'; font-size:30px; color:#fff; opacity:0.3; border:1px solid #fff;}
#arr #right{right:5px; left:auto;}

</style>
<script type="text/javascript">

    window.onload = function () {


    //需求：我们鼠标放到li上，指定图片播放。加定时器，一秒钟动一次。
    //步骤：
    //1、克隆图片加入到ul中
    //2、动态生成li。
    //3、焦点悬停动画。
    //4、加定时器
        //1、
        //2、



    //1、克隆图片加入到ul中
        //1、获取相关元素
        var all = document.getElementById("all");
        var screen = document.getElementById("screen");
        var ul = screen.children[0];
        var lis = ul.children;
        var ol = screen.children[1];
        var firstLi = ul.children[0];



        var arr = document.getElementById("arr");
        var arrLeft = arr.children[0];
        var arrRight = arr.children[1];


        //2、克隆
        var newLi = firstLi.cloneNode(true);
        //3、加入到图片最后   a.appendChild(b);
        ul.appendChild(newLi);

    //2、动态生成li。
        for(var i=0;i<lis.length-1;i++){
            var lilili = document.createElement("li");
            lilili.innerHTML = i+1;
            ol.appendChild(lilili);
        }

    //3、焦点悬停动画。
        //1、小方块的颜色切换(排他思想)
        var olLis = ol.children;
        olLis[0].className = "current";
        for(var i=0;i<olLis.length;i++){
            olLis[i].index = i;
            olLis[i].onmouseover = function () {
                for(var j=0;j<olLis.length;j++){
                    olLis[j].className = "";
                }
                this.className = "current";

                key = square = this.index;
                //2、图片的切换
                animate(ul,-this.index*lis[0].offsetWidth)
            }
        }

    //4、加定时器
        var timer = null;
        //图片
        var key = 0;
        //小方块
        var square = 0;

        timer = setInterval(autoPlay,1000);

        function autoPlay(){
            key++;
            square++;
            if(key>5){
                key=1;
                ul.style.left = 0+ 'px';
            }
            animate(ul,-key*lis[0].offsetWidth);

            square = square > olLis.length-1? 0:square;
            for(var i=0;i<olLis.length;i++){
                olLis[i].className = "";
            }
            olLis[square].className = "current";

        }


    //1、清除定时器
        all.onmouseover = function () {
            arr.style.display = "block";
            clearInterval(timer);
        }
        all.onmouseout = function () {
            arr.style.display = "none";
            timer = setInterval(autoPlay,1000);
        }
    //2、

        arrRight.onclick = function () {
            autoPlay();
        }

        arrLeft.onclick = function () {
            key--;
            square--;
            if(key<0){
                key=4;
                ul.style.left = -5*lis[0].offsetWidth+ 'px';
            }
            animate(ul,-key*lis[0].offsetWidth);

            square = square <0 ? 4:square;
            for(var i=0;i<olLis.length;i++){
                olLis[i].className = "";
            }
            olLis[square].className = "current";
            console.log(key+"  " + square);
        }

    }
    function animate(obj,target) {
        clearInterval(obj.timer)

        var speed = obj.offsetLeft < target ? 15 : -15;

        obj.timer = setInterval(function () {
            var result = target - obj.offsetLeft;

            obj.style.left = obj.offsetLeft + speed + "px";
            console.log(speed);
            if(Math.abs(result) <= 10 ){
                clearInterval(obj.timer);
                obj.style.left = target + "px";
            }

        },10);
    }
</script>

</head>

<body>
<div class="all" id='all'>
	<div class="screen" id="screen">
        <ul id="ul">
            <li><img src="images/1.jpg" width="500" height="200" /></li>
            <li><img src="images/2.jpg" width="500" height="200" /></li>
            <li><img src="images/3.jpg" width="500" height="200" /></li>
            <li><img src="images/4.jpg" width="500" height="200" /></li>
            <li><img src="images/5.jpg" width="500" height="200" /></li>
        </ul>
        <ol></ol>
        <div id="arr"><span id="left"><</span><span id="right">></span></div>
    </div>
</div>
</body>
</html>
